Dust trap



M. LOVE DUST TRAP Dec. 10, 1929.

Filed Nov. 11, 1925 2 Sheets-Sheet 1 INVENTOR AITORNEY M. LOVE DUST TRAPDec. 10, 1929.

Filed Nov. 11, 1925 2 Sheets-Sheet Patented Dec. 10, 1929 UNITED STATESPATENT OFFICE MICHAEL LOVE, OF PITTSBURGH, PENNSYLVANIA DUST Applicationfiled November This invention relates to new and useful improvements'indust traps and has for its principal object the provision of an improvedconstruction of this character which will be highly ellicient in use andeconomical in manufacture.

Among the salient objects of the invention is the provision of a deviceof this character arranged and adapted to trap flue dust and otherforeign particles of matter which would, if not trapped, be carried withthe gas from the blast furnace to the boiler such as is generally usedin foundries and steel works.

A further object of the invention is the provision of a dust trap, theconstruction of which is such that the removal of dust trapped thereincan be conveniently made and interior or exterior repairs can be made atan economical cost, with safety to the workers, and withoutdiscontinuing the flow of gas to the boilers.

A further object of the invention is the provision of a pair of dusttraps of the character to be hereinafter described which are incommunication with a blast furnace and boiler in such manner that one orboth of the traps can be shut off for the purpose of making repairs orfor removing the dust and other particles therefrom.

Other objects will appear hereinafter.

The invention consists in the combination and arrangement of partshereinafter described. i

The invention will be best understood by 5 reference to the accompanyingdrawings showing the preferred form of construction and in which:

Fig. 1 is a top plan view of the invention showing the preferred form ofconstruction. Fig. 2 is a side elevational view-of one of the dust trapsembodied in the invention.

Fig. 3 is a vertical sectional view taken substantially on line 3-3 ofFig. 1.

Fig. l is a vertical sectional view taken sub- 5 stantially on line 4-4of Fig. 1.

Fig. 5 is a sectional view taken substantially on line 55 of Fig. 1.

Fig. 6 is a fragmentary sectional view taken substantially on line 6-6of Fig. 1.

Fig. 7 is a side elevational View of one of TRAP 11, 1925. Serial NO.68,390.

the shut-0H plates taken substantially on line 7-7 of Fig. 1.

Fig. 8 is a detail view on line 88 of Fig. 1.

Referring to the drawings illustrating the preferred form ofconstruction, 10 indicates a blast furnace of the type employed in steelmills which is in communication with boilers (not shown) by means of aconductor pipe 11 through which gas from the blast furnace passes toboilers and passage through the conductor pipe is controlled by a gatevalve 12, of an approved type, which in turn is manually controlled by asprocket chain 11 passing over a sprocket wheel 12. Communicating withthe conductor pipe 11, rearwardly of the gate valve 12, are branchconductor pipes 13 and 14; which have con'nnunication with traps 15 and16 respectively and passage through these pipes is likewise controlledby gate valves 17 and 18. This arrangement is such that the gas flowingfrom the blast furnace can be diverted through either of the pipes 13 or14 into the trap com municating with the pipe through which the gas isflowing, by closing the gate valve 12 and the gate valve of the branchpipe through which passage is to be shut off.

The conductor pipes and the traps, as best illustrated in Figs. 2 to linclusive, are preferably constructed of an outer casing 19 formed ofmetallic material and lined with a non-combustible material as indicat dat 20, the non-combustible material protecting the outer casing from theheat and chemicals of the gas.

As illustrated the traps are provided with a number of spaced baffleplates 22 forming a zig-zag passage 23 through each of the traps andthese baflle plates are preferably lined with non-combustible materialto protect the metallic material from which they are formed from theheat and chemical acids of the gas. The gas entering the traps from theconductaken substantially tor pipes 13 and 14 is diverted in a zig-zagcourse through the traps and during passage thereof the balfle platesintercede and arrest dust and deposit the same within the traps. Theclean gas continues its course through exit branch conductor pipes 24and 25 which )ressure this bein accomplished b closin 7 o L t) thenecessary valves so as to divert the gas to the particular trap desired.

In addition to the branch pipe gate valves, which are employed for thepurpose of closing the passage through these pipes, I also provide shutoff plates 28 which are oblong in shape with semi-circular ends 29 andthese shut off plates are ordinarily used to close the passage throughthe conductor pipes leading to the traps when the traps are not in useduring cleaning or repairing. As shown in Fig. 7, a circular opening 30is formed in one portion of each of the shut off plates 28 and thisopening, when the shut off plates 28 are mounted to permit passagethrough the branch pipe with which used, is in registration with thepassage of that branch pipe and when mounted in this position the shutofi plate is bolted to flanges 31 carried by the conductor pipe. I/Vhenit is desired to close the passage through this pipe, by means of theshut-off plate, the bolts are removed from the same and the shut offplate shifted so as to bring the solid portion 32 in closing position,thus cutting ofi communication through the conductor pipe. As shown inFig. 7 handles 33 are provided on each of the shut off plates to afiordmanual manipulation.

Provision is provided to gain access to the interior of the traps forthe purpose of removing the accumulated dust or for the purpose ofmaking repairs. To permit this removal, man-holes 84 are formed in thetop walls 35 of the dust traps and are normally closed by covers 36hingedly mounted as at 87, there being a ladder 29 provided affordingmeans of reaching the covers 36. Openings 38 are. also provided for theabove purpose and these openings are normally closed by doors 39slidably mounted in guide ways 40 and are manipulated by cables 41extending over a pulley 42 as best shown in Fig. 4. I also provideopenings 43 in the conductor pipes, as best shown in Figs. 1 and 5 forremoving accumulated dust from these pipes and these openings arenormally closed by drop doors 44 hingedly mounted as at 45 andmanipulated by means of a. c ble 46 extending through openings 47 asshown in Fig. 5.

An object of the invention as herein stated, is to trap the dust andother foreign particles of matter travelling with the gasformed in theside walls of the traps from a blast furnace to a boiler and toaccomplish this object I have, as will be apparent from the foregoingdescription, provided traps and other means whereby the flow of gas neednot be discontinued when one or both of the traps are to be shut offfrom communication with the blast furnace and boiler, as it will benoted that the flow of gas is manually controlled and may flow througheither of the conductor pipes 11, 13 or 14. Then the gas flows througheither of the conduct-or pipes 13 or 14 it is diverted into the trap incommunication with that particular conductor pipe and as the gas passesthrough the trap particles of dust and other foreign matter carriedtherewith are interceded and arrested by the baflle plates and trappedwithin the traps leaving the gas to find exit through the exit conductorpipes free from the usual dust and other foreign particles of matter.

The invention having been set forth, what I claim as new and usefulis 1. In a device of the class described, a main conduit having pairs ofbranch conduits extending therefrom at spaced apart points whereby anintermediate portion is defined in said main conduit, said branchconduits extending from said main conduit at acute angles to theintermediate portion thereof, dust traps, conduits leading to said dusttraps adapted to be connected to said branch conduits, and valve meansin said branch conduits and in the intermediate portion of said mainconduit adapted to be opened or closed in predetermined arrangementswhereby to regulate passage through or past' said dust traps. Y

2. In a device of the class described, a main conduit having pairs ofbranch conduits extending therefrom at spaced apart points whereby anintermediate portion is defined in said main conduit, said branchconduits extending from said main conduit at acute angles to theintermediate portion thereof, dust traps, conduits extending from saiddust traps adapted to be connected to said branch conduits, valve meansin said branch conduits, valve means in the intermediate portion of saidmain conduit, and means in said conduits leading to said dust trapsadapted to be arranged such that said dust traps may be permanentlyclosed against passage from said main conduit thereinto and therefrom atpredetermined times.

In testimony whereof I affix my signature.

MICHAEL LOVE.

